Ответ:
Объяснение:1)3,9/2,8 :13/14=39/28·14/13=(39·14)/(28·13)=3/2.
2)3,3/8,8·11/4=33/88·11/4=(33·11)/(88·4)=33/32;
3)3/2+33/32=(48+33)/32=81/32;
4)3,7·0,4=1,48;
5)15,54:4,2=155,4:42=3,7;
6)1,48-3,7= -2,22;
7)81/32:(-2,22)= -81/32:111/50= - (81·50)/(32·111)=-(27·25)/(16·37)=-675/592=
-1 83/592.
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Ответ:
Объяснение:1)3,9/2,8 :13/14=39/28·14/13=(39·14)/(28·13)=3/2.
2)3,3/8,8·11/4=33/88·11/4=(33·11)/(88·4)=33/32;
3)3/2+33/32=(48+33)/32=81/32;
4)3,7·0,4=1,48;
5)15,54:4,2=155,4:42=3,7;
6)1,48-3,7= -2,22;
7)81/32:(-2,22)= -81/32:111/50= - (81·50)/(32·111)=-(27·25)/(16·37)=-675/592=
-1 83/592.